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diff --git a/linden/indra/llmath/llvolumemgr.cpp b/linden/indra/llmath/llvolumemgr.cpp
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+++ b/linden/indra/llmath/llvolumemgr.cpp
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+/** 
+ * @file llvolumemgr.cpp
+ *
+ * Copyright (c) 2002-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#include "linden_common.h"
+
+#include "llvolumemgr.h"
+#include "llvolume.h"
+
+
+//#define DEBUG_VOLUME
+
+LLVolumeMgr* gVolumeMgr = 0;
+
+const F32 BASE_THRESHOLD = 0.03f;
+
+//static
+F32 LLVolumeLODGroup::mDetailThresholds[NUM_LODS] = {BASE_THRESHOLD,
+                                                                                                         2*BASE_THRESHOLD,
+                                                                                                         8*BASE_THRESHOLD,
+                                                                                                         100*BASE_THRESHOLD};
+
+//static
+F32 LLVolumeLODGroup::mDetailScales[NUM_LODS] = {1.f, 1.5f, 2.5f, 4.f};
+
+//============================================================================
+//static
+void LLVolumeMgr::initClass()
+{
+        gVolumeMgr = new LLVolumeMgr();
+}
+
+//static
+BOOL LLVolumeMgr::cleanupClass()
+{
+        BOOL res = FALSE;
+        if (gVolumeMgr) {
+                res = gVolumeMgr->cleanup();
+                delete gVolumeMgr;
+                gVolumeMgr = 0;
+        }
+        return res;
+}
+
+//============================================================================
+
+LLVolumeMgr::LLVolumeMgr()
+{
+        mDataMutex = new LLMutex(gAPRPoolp);
+//      mNumVolumes = 0;
+}
+
+LLVolumeMgr::~LLVolumeMgr()
+{
+        cleanup();
+        delete mDataMutex;
+}
+
+BOOL LLVolumeMgr::cleanup()
+{
+        #ifdef DEBUG_VOLUME
+        {
+                lldebugs << "LLVolumeMgr::cleanup()" << llendl;
+        }
+        #endif
+        BOOL no_refs = TRUE;
+        mDataMutex->lock();
+        for (volume_lod_group_map_t::iterator iter = mVolumeLODGroups.begin(),
+                         end = mVolumeLODGroups.end();
+                 iter != end; iter++)
+        {
+                LLVolumeLODGroup *volgroupp = iter->second;
+                if (volgroupp->getNumRefs() != 1)
+                {
+                        llwarns << "Volume group " << volgroupp << " has " 
+                                        << volgroupp->getNumRefs() << " remaining refs" << llendl;
+                        llwarns << volgroupp->getParams() << llendl;
+                        no_refs = FALSE;
+                }
+                volgroupp->unref();// this );
+        }
+        mVolumeLODGroups.clear();
+        mDataMutex->unlock();
+        return no_refs;
+}
+
+LLVolume *LLVolumeMgr::getVolume(const LLVolumeParams &volume_params, const S32 detail)
+{
+        LLVolumeLODGroup* volgroupp;
+        mDataMutex->lock();
+        volume_lod_group_map_t::iterator iter = mVolumeLODGroups.find(&volume_params);
+        if( iter == mVolumeLODGroups.end() )
+        {
+                volgroupp = new LLVolumeLODGroup(volume_params);
+                const LLVolumeParams* params = &(volgroupp->getParams());
+                mVolumeLODGroups[params] = volgroupp;
+                volgroupp->ref(); // initial reference
+        }
+        else
+        {
+                volgroupp = iter->second;
+        }
+        volgroupp->ref();// this );
+        mDataMutex->unlock();
+        //      mNumVolumes++;
+        #ifdef DEBUG_VOLUME
+        {
+                lldebugs << "LLVolumeMgr::getVolume() " << (*this) << llendl;
+        }
+        #endif
+        return volgroupp->getLOD(detail);
+}
+
+void LLVolumeMgr::cleanupVolume(LLVolume *volumep)
+{
+        if (volumep->isUnique())
+        {
+                // TomY: Don't need to manage this volume. It is a unique instance.
+                return;
+        }
+        LLVolumeParams* params = (LLVolumeParams*) &(volumep->getParams());
+        mDataMutex->lock();
+        volume_lod_group_map_t::iterator iter = mVolumeLODGroups.find(params);
+        if( iter == mVolumeLODGroups.end() )
+        {
+                llerrs << "Warning! Tried to cleanup unknown volume type! " << *params << llendl;
+                mDataMutex->unlock();
+                return;
+        }
+        else
+        {
+                LLVolumeLODGroup* volgroupp = iter->second;
+
+                volgroupp->derefLOD(volumep);
+                volgroupp->unref();// this );
+                if (volgroupp->getNumRefs() == 1)
+                {
+                        mVolumeLODGroups.erase(params);
+                        volgroupp->unref();// this );
+                }
+                //      mNumVolumes--;
+        }
+        mDataMutex->unlock();
+
+        #ifdef DEBUG_VOLUME
+        {
+                lldebugs << "LLVolumeMgr::cleanupVolume() " << (*this) << llendl;
+        }
+        #endif
+}
+
+void LLVolumeMgr::dump()
+{
+        F32 avg = 0.f;
+        mDataMutex->lock();
+        for (volume_lod_group_map_t::iterator iter = mVolumeLODGroups.begin(),
+                         end = mVolumeLODGroups.end();
+                 iter != end; iter++)
+        {
+                LLVolumeLODGroup *volgroupp = iter->second;
+                avg += volgroupp->dump();
+        }
+        int count = (int)mVolumeLODGroups.size();
+        avg = count ? avg / (F32)count : 0.0f;
+        mDataMutex->unlock();
+        llinfos << "Average usage of LODs " << avg << llendl;
+}
+
+std::ostream& operator<<(std::ostream& s, const LLVolumeMgr& volume_mgr)
+{
+        s << "{ numLODgroups=" << volume_mgr.mVolumeLODGroups.size() << ", ";
+
+        S32 total_refs = 0;
+        volume_mgr.mDataMutex->lock();
+
+        LLVolumeMgr::volume_lod_group_map_iter iter = volume_mgr.mVolumeLODGroups.begin();
+        LLVolumeMgr::volume_lod_group_map_iter end  = volume_mgr.mVolumeLODGroups.end();
+        for ( ; iter != end; ++iter)
+        {
+                LLVolumeLODGroup *volgroupp = iter->second;
+                total_refs += volgroupp->getNumRefs();
+                s << ", " << (*volgroupp);
+        }
+
+        volume_mgr.mDataMutex->unlock();
+
+        s << ", total_refs=" << total_refs << " }";
+        return s;
+}
+
+LLVolumeLODGroup::LLVolumeLODGroup(const LLVolumeParams &params)
+{
+        S32 i;
+        mParams = params;
+
+        for (i = 0; i < NUM_LODS; i++)
+        {
+                mLODRefs[i] = 0;
+                mVolumeLODs[i] = NULL;
+                mAccessCount[i] = 0;
+        }
+}
+
+LLVolumeLODGroup::~LLVolumeLODGroup()
+{
+        S32 i;
+        for (i = 0; i < NUM_LODS; i++)
+        {
+                delete mVolumeLODs[i];
+                mVolumeLODs[i] = NULL;
+        }
+}
+
+
+LLVolume * LLVolumeLODGroup::getLOD(const S32 detail)
+{
+        llassert(detail >=0 && detail < NUM_LODS);
+        mAccessCount[detail]++;
+        mLODRefs[detail]++;
+        if (!mVolumeLODs[detail])
+        {
+                mVolumeLODs[detail] = new LLVolume(mParams, mDetailScales[detail]);
+        }
+        return mVolumeLODs[detail];
+}
+
+BOOL LLVolumeLODGroup::derefLOD(LLVolume *volumep)
+{
+        S32 i;
+        for (i = 0; i < NUM_LODS; i++)
+        {
+                if (mVolumeLODs[i] == volumep)
+                {
+                        mLODRefs[i]--;
+                        if (!mLODRefs[i])
+                        {
+                                mVolumeLODs[i] = NULL;
+                        }
+                        return TRUE;
+                }
+        }
+        llerrs << "Deref of non-matching LOD in volume LOD group" << llendl;
+        return FALSE;
+}
+
+S32 LLVolumeLODGroup::getDetailFromTan(const F32 tan_angle)
+{
+        S32 i = 0;
+        while (i < (NUM_LODS - 1))
+        {
+                if (tan_angle <= mDetailThresholds[i])
+                {
+                        return i;
+                }
+                i++;
+        }
+        return NUM_LODS - 1;
+}
+
+F32 LLVolumeLODGroup::getVolumeScaleFromDetail(const S32 detail)
+{
+        return mDetailScales[detail];
+}
+
+F32 LLVolumeLODGroup::dump()
+{
+        char dump_str[255];
+        F32 usage = 0.f;
+        for (S32 i = 0; i < NUM_LODS; i++)
+        {
+                if (mAccessCount[i] > 0)
+                {
+                        usage += 1.f;
+                }
+        }
+        usage = usage / (F32)NUM_LODS;
+
+        sprintf(dump_str, "%.3f %d %d %d %d", usage, mAccessCount[0], mAccessCount[1], mAccessCount[2], mAccessCount[3]);
+
+        llinfos << dump_str << llendl;
+        return usage;
+}
+
+std::ostream& operator<<(std::ostream& s, const LLVolumeLODGroup& volgroup)
+{
+        s << "{ numRefs=" << volgroup.getNumRefs();
+        s << ", mParams=" << volgroup.mParams;
+        s << " }";
+         
+        return s;
+}
+